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Properties of concrete containing nonground ash and slag as fine aggregate

Yüksel, İsa | Genç, Ayten

Article | 2007 | ACI Materials Journal104 ( 4 ) , pp.397 - 403

The possibility of using granulated blast-furnace slag (GBFS), furnace bottom ash (FBA), and their combination as fine aggregates in concrete was studied by performing experiments. These materials were used without applying any preprocesses such as sieving and grinding. The compressive, flexural, and split tensile strengths of concretes with natural sand replaced with GBFS, FBA, and GBFS plus FBA at 10, 20, 30, 40, and 50% were examined at a fixed water-cement ratio (w/c). The percentages represent the replacement percentage of fine aggregate by GBFS, FBA, or their combination and were evaluated depending on weight basis. Also, micr . . .ostructure and water absorption capacity of concrete were researched. Test results showed that concrete strength decreases with increasing replacement ratio with respect to reference concrete. In addition, FBA decreases the strength of concrete more than GBFS. In particular, the strength of concrete was detrimentally affected when the replacement ratio was beyond 40%. The micro structure studies showed that different pore structures were formed in the concrete depending on the replacement material, that is, GBFS or FBA. It is concluded that the main reason for the strength reduction in new concrete is the formation of a porous concrete structure. Moreover, an increase trend in water absorption capacity was observed for both replacement materials. Copyright © 2007, American Concrete Institute. All rights reserved Daha fazlası Daha az

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